KML

Description: Keyhole Markup Language (KML) is an XML-based markup language designed to annotate and overlay visualizations on various two-dimensional, Web-based online maps or three-dimensional Earth browsers (such as Google Earth). In fact, KML was initially developed for use with Google Earth; because that project was originally named Keyhole, as was the company that undertook this work, the related markup language followed suit. When Google acquired Keyhole in 2004, that project came with it and eventually became Google Earth.
This is a freehand drawing illustration.